空间信息网体系结构与路由协议研究

发布时间：2018-03-15 01:28

本文选题：空间信息网　切入点：覆盖率　出处：《北京理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：在阐述空间信息网的基本概念和技术原理的基础上，研究了空间信息网分层网络的构成，分别对LEO层卫星和GEO层卫星的特性进行了分析，并提出了GEO/LEO双层星座的系统模型，结合中国的地理区域，对星座覆盖率进行了仿真分析，进而对相应的LEO星座和GEO星座进行了设计，提出了一种适用于中国的空间信息网体系结构方案。分析了地面移动自组网路由协议，同卫星节点进行了对比，针对空间信息网中卫星节点移动速度快，延时大，链路连通时间短，抗毁性差的特点，提出了在空间信息网中采用动态源路由协议的方案。之后将地面自组网典型的动态源路由协议DSR协议应用到空间信息网卫星路由中，对仿真结果进行了分析，发现直接利用地面自组网的协议，出现了路由流量过大，尤其是路由发现阶段的流量过大，链路生存时间短，路由链路不稳定，链路拥塞概率大等问题。针对地面协议直接应用到卫星路由出现的问题，提出了一种适用于空间信息网的卫星自组织路由协议，算法包含两个部分，分别是单路径路由算法和多路径路由算法。在单路径算法中对一般动态源路由协议路由发现时的泛洪路由进行了优化，可以在一定程度上指导路由广播过程的渠道，进而降低路由流量，同时对缓存路由回复和路由维护进行了改进；在多路径算法中对多路径寻找、多路径选择和多路径权重分配都进行了设计，为了保证端到端延时抖动小，选择利用延时作为多路径选择的主要判断准则。为了保证链路流量可以得到合理的分配，选择利用不同轨道间的星际链路的个数作为多路径权重分配的主要法则，因为不同轨道间的星际链路同链路的生存时间和链路的稳定性有较大的关系。仿真结果表明，跟传统的地面移动自组网DSR路由协议相比，卫星自组网路由协议的单路径算法在保证路由流量降低的同时，保证了链路的连通时间更长，，所选路由的链路更加稳定。卫星自组网路由协议的多路径算法相比于单路径算法网络发生拥塞的概率更低，排队延迟的时间更短，分组投递率随着业务的增加下降的速度更慢。
[Abstract]:On the basis of expounding the basic concept and technical principle of space information network, the structure of layered network of space information network is studied, the characteristics of LEO layer satellite and GEO layer satellite are analyzed, and the system model of GEO/LEO bilevel constellation is put forward. Combined with the geographical region of China, the constellation coverage is simulated and analyzed, and the corresponding LEO constellation and GEO constellation are designed, and a spatial information network architecture scheme suitable for China is proposed. In this paper, the routing protocol of ground mobile ad hoc network is analyzed and compared with satellite node. Aiming at the characteristics of fast moving speed, large delay, short link connection time and poor survivability of satellite nodes in space information network, the routing protocol of ground mobile ad hoc network is analyzed. This paper proposes a scheme of dynamic source routing protocol in spatial information network, and then applies DSR protocol, a typical dynamic source routing protocol, to satellite routing in spatial information network. The simulation results are analyzed. It is found that the routing traffic is too large, especially in the route discovery stage, the link lifetime is short, the routing link is unstable, and the probability of link congestion is large. In order to solve the problem that ground protocol is directly applied to satellite routing, a satellite self-organizing routing protocol for spatial information network is proposed. The algorithm consists of two parts. Single path routing algorithm and multipath routing algorithm. In the single path algorithm, the flooding routing of general dynamic source routing protocol is optimized, which can guide the routing broadcast process to a certain extent. Then the routing traffic is reduced, and the cache routing recovery and route maintenance are improved. In the multipath algorithm, multipath search, multipath selection and multipath weight allocation are designed to ensure small end-to-end delay jitter. In order to ensure the reasonable allocation of link traffic, the number of interstellar links between different orbits is chosen as the main rule of multipath weight allocation. Because the interstellar link between different orbits has a great relationship with the lifetime and stability of the link. The simulation results show that compared with the traditional DSR routing protocol, the single-path algorithm of satellite ad hoc network can guarantee the decrease of routing traffic and the longer link connectivity time. Compared with the single path algorithm, the multipath algorithm of satellite ad hoc network has lower probability of congestion, shorter time of queue delay, and slower rate of packet delivery with the increase of traffic.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927.2

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